Patent GB-1020455-A (GB)
Title: Improvements in or relating to fastener inserting machines
IPC: A43D69/04
Filed: 1962-10-23
Abstract: 1,020,455. Fastener inserting machine. BRITISH UNITED SHOE MACHINERY CO. Ltd. Oct. 23, 1962 [Oct. 26, 1961], No. 40010/62. Heading A3B. A fastener inserting machine comprising a plurality of drivers for pricking holes in a workpiece and subsequently driving fasteners thereinto in a cycle of operation of the machine is so constructed that two pricking operations are performed in an operating cycle of the machine and in the first operation only some of the drivers penetrate the workpiece. A cross brace member 30 (Figs. 1 and 2, not shown) has a tongue 36 extending downwardly, with a cam roll 38 engaging the lower peripheral edge of a cam 12, and a bracket 40 with a cam roll 42 engageable with the top of a cam 10, both cams keyed to a drive shaft driven by a continuously operating motor 26. Mounted on the member 30 is a housing 44 for a driver actuating hydraulic cylinder and piston assembly 50. A pair of driver carrier side plates 28 are provided with splines for guiding a driver unit holder 76, spaced upward from the housing 44 and yieldably supported by resilient coil springs 78. The piston 50 has an integral piston shaft 82 extending through the housing 44 and slidably journalled through the base of holder 76 and having another driver unit holder 86 secured to its upper end which is slidably mounted within the central portion of holder 76. Drivers are assembled in two separate groups, one comprising a series of long drivers L mounted in the lower driving unit and the other comprising a series of short drivers S mounted in the upper driving unit. When the drivers are aligned and pushed into their respective units, the driver guide plate 90E will be correctly located. A pair of releasable latches 96, 98 (Fig. 4, not shown) are provided which can unite the holder assembly 76 with the shaft 82. In operation first the cam 10 causes the carrier 30 to be elevated, hence lifting the housing 44, and via the piston 50 the shaft 82 is caused to move upward. The driver unit 76 is not latched to 82 and hence the drivers S are urged upward only against the resilient force of springs 78 and the resistance to penetration as they touch the work causes the spring 78 to yield and the drivers L only to penetrate the work. As they reach the end of the pricking stroke, the hydraulic pressure of the unit 50 reaches its peak, causing a dump valve to yield, and this plus the cams 10 and 12 cause the drivers L to retract. The latch 96 engages a recess in the shaft 82, the piston 50 once more moves up, and the housing 44 is moved up by cams. Thus the drivers S are caused to penetrate the work, the drivers L going through their previous holes, and at the end of the stroke the pressure in the hydraulic valve builds up once more, and the dump valve yields. During the resulting downward stroke, the latch 98 engages the shaft 82, and in the lowermost position a loader block is moved to the fastener driving position, aligning a fastener in the path of each driver. As the cam shaft 14 rotates the housing 44 rises causing the ends of drivers L to be even with those of S, when the latch 98 becomes effective to cause the drivers S also to be raised, and the fasteners are driven into the work, the cams being just sufficient to raise the drivers the appropriate amount.